Well ive definitely got something

Any possibility you got your mixed nutrient water on the leaves?

Never seen white spots. Only time ive ever seen any part of Cannabis turn white, besides stigmas of course which just are white, was light bleaching and thats not it
 
Yep, since they didn't turn black or rusty colored I'd easily repeat what others have said. Its a spill of nutrient water or just regular water.
Nutrient water will burn the leaves because the salts, regular water will burn it if light hits it directly, making it a magnifying glass.
Dont stress about it, try to be more cautious.
 
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